Air siren
Sound Signal Unit using periodic leakage of compressed air through the rotary switch for opening and closing .
| Mark Name | Type | Location | Whistling Cycle | Siren Arrival Distance | Lighthouse No. | |
|---|---|---|---|---|---|---|
| N Coordinate | E Coordinate | |||||
| Sori-do Lighthouse | Air Siren | 34°24.6′ | 127°48.1′ | Whistle once every 54 seconds (Whistle for 4 seconds, silent for 50 seconds) |
2.7 mile | 2494 |
| Geomun-do Lighthouse | Air Siren | 34°00.2′ | 127°19.5′ | Whistle once every 50 seconds (Whistle for 5 seconds, silent for 45 seconds) |
6 mile | 2498 |